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2017-2023
World's most polluted cities
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
2023
World Air Quality Report
PM2.5 legend
0-5
Meets WHO guideline
5.1-10
Exceeds by 1 to 2 times
10.1-15
Exceeds by 2 to 3 times
15.1-25
Exceeds by 3 to 5 times
25.1-35
Exceeds by 5 to 7 times
35.1-50
Exceeds by 7 to 10 times
>50.1
Exceeds by over 10 times
Rank | City | 2023 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Coraopolis, USA | 19.3 | 7.9 | 6.5 | 6.8 | 5.5 | 8.8 | 23.4 | 18.2 | 22.2 | 42.1 | 54.2 | 11.8 | 8.6 | 7.2 | -- | -- | -- | -- | -- |
| 2 | Forest Park, USA | 17.6 | 13.6 | 14.5 | 18.6 | 13.7 | 16 | 24.1 | 19.9 | 20.2 | 18.7 | 20.8 | -- | -- | 15.5 | 16.8 | -- | -- | -- | -- |
| 3 | Cave Junction, USA | 17.1 | 11 | 14.8 | 7.2 | 5.2 | 4.6 | 3 | 12.2 | 90.5 | 28.7 | 6.3 | 11.5 | 9.4 | 9.7 | 8.9 | 15.3 | 7.5 | 13.3 | 12 |
| 4 | Happy Camp, USA | 16.8 | 9.9 | 17.4 | 13.3 | 5.3 | 4.5 | 4.7 | 14.1 | 65.4 | 43 | 6.2 | 18.2 | 16.6 | 9.6 | 18.8 | 28 | 13 | -- | -- |
| 5 | Adrian, USA | 16.6 | 21.7 | 15.7 | 15.5 | 13.7 | 12.4 | 34.7 | 18.4 | 19.1 | 13.8 | 8.6 | 12.3 | 13.1 | 14.7 | 15.1 | -- | -- | -- | -- |
| 6 | Claymont, USA | 16.5 | 16.1 | 17.9 | 14.3 | 13.3 | 12.7 | 32.2 | 20.7 | 17.8 | 13.8 | 11.8 | 13.5 | 15.1 | 16.4 | 16.7 | -- | -- | -- | -- |
| 7 | Robesonia, USA | 16.3 | 17.8 | 20.5 | 12.7 | 12.9 | 11.9 | 37.9 | 19.7 | 14.5 | 10.8 | 7.7 | 13.5 | 16.8 | 19.5 | -- | -- | -- | -- | -- |
| 8 | Attleboro, USA | 15.8 | 4.1 | 84.2 | -- | -- | 1.5 | -- | 15.6 | 10.5 | 11.4 | 6.4 | 8.4 | 8.8 | 5.3 | 8.1 | -- | -- | -- | -- |
| 9 | Elwood, USA | 15.6 | 18.6 | 13.5 | 14.3 | 11.5 | 12.1 | 32.2 | 16.2 | 17.4 | 12.7 | 7.6 | -- | -- | 14 | 14.9 | -- | -- | -- | -- |
| 10 | Huntington, USA | 15.5 | 19.7 | 13.8 | 12.6 | 12.3 | 12.3 | 30 | 20.1 | 18.6 | 13.6 | 8.1 | 10.2 | 9.8 | 14.1 | 15.7 | -- | -- | -- | -- |
| 11 | Gordonville, USA | 15.4 | 17.8 | 19.4 | 14.5 | 14.8 | 15.1 | 38.9 | 13.5 | 10 | 7.7 | 8.6 | 12.7 | 12.6 | 14.5 | 13.7 | 9.7 | 11 | 9.2 | 10.8 |
| 12 | Baldwin Park, USA | 15.3 | 16.1 | 11.9 | 13.4 | 21.2 | 14.4 | 16.8 | 25.3 | 16.3 | 7 | 11.7 | 12.1 | 18 | 17.8 | 18.8 | -- | -- | -- | -- |
| 13 | Ridgewood, USA | 15.3 | 3.3 | 4.8 | 4.8 | 3.7 | 4.5 | 5.3 | 6.3 | 6.5 | 7.3 | 7.1 | 114.7 | 5.3 | 7.8 | -- | -- | -- | -- | -- |
| 14 | McCook, USA | 15.2 | 14.5 | 12.1 | 12.1 | 12.8 | 14 | 37.1 | 19.9 | 12.1 | 10.9 | 9.6 | 11.2 | 11.6 | 48.6 | -- | -- | -- | -- | -- |
| 15 | Peotone, USA | 15.1 | 19.7 | 12.8 | 14 | 11.8 | 12.6 | 33.1 | 17.4 | 16.4 | 12.9 | 7.5 | 10.1 | 10.3 | 14.9 | 16.7 | -- | -- | -- | -- |
| 16 | Woodstock, USA | 15.1 | 18.4 | 11.7 | 13.4 | 10.3 | 10.6 | 34.1 | 16.4 | 17.1 | 1.8 | 2.4 | 3.7 | 2.3 | 13.7 | -- | -- | -- | -- | -- |
| 17 | Cutler, USA | 14.9 | 14.9 | 17.5 | 8.9 | 14.2 | 9.7 | 12.8 | 15.4 | 16 | 16.6 | 14.6 | 17.8 | 25.6 | 15.3 | 24.7 | -- | -- | -- | -- |
| 18 | Salton City, USA | 14.9 | 5.2 | 18.6 | 22.7 | 36 | 32.9 | 21.7 | 8.9 | 6.3 | 10.9 | 5.4 | 6.1 | 6.9 | 8.5 | 6.8 | -- | -- | -- | -- |
| 19 | Homer, USA | 14.9 | -- | -- | 14.1 | 10.4 | 11.7 | 35.3 | 17.4 | 18.7 | 14.3 | 7.8 | 10.5 | 10 | -- | -- | -- | -- | -- | -- |
| 20 | Columbia, USA | 14.9 | 15.8 | 15.7 | 11.1 | 11.5 | 12.2 | 33.9 | 18.9 | 15.4 | 11.7 | 7.6 | 11.1 | 15.3 | 18.8 | -- | -- | -- | -- | -- |
| 21 | La Pine, USA | 14.8 | 14.6 | 12.2 | 10.5 | 7.5 | 8.5 | 4.3 | 28.7 | 44.7 | 13.9 | 9 | 13.4 | 9.4 | 15.7 | 10.1 | -- | -- | -- | -- |
| 22 | Beloit, USA | 14.8 | 12.1 | 7.9 | 11.3 | 10.3 | 10.7 | 41.7 | 18 | 17.6 | 12.3 | 7.5 | 13.7 | -- | 10.4 | -- | -- | -- | -- | -- |
| 23 | Orleans, USA | 14.7 | 6 | 7.1 | 5 | 3.3 | 3.7 | 4.7 | 11.7 | 63.7 | 51.3 | 6 | 7.4 | 4.6 | 8.3 | 19.6 | 20.8 | 8.2 | -- | -- |
| 24 | Harvard, USA | 14.7 | 19.5 | 12.2 | 13.7 | 10.7 | 10 | 37.4 | 16.4 | 17.3 | 12 | 7.1 | 9.7 | 11 | 21.4 | -- | -- | -- | -- | -- |
| 25 | Lemont, USA | 14.7 | 13.4 | 11.3 | 12.1 | 11.7 | 13.1 | 33.2 | 17.7 | 14.8 | 11.6 | 10.5 | 11.7 | 11.3 | 45.7 | -- | -- | -- | -- | -- |
| 26 | Willowbrook, USA | 14.7 | 17.9 | 13.1 | 13.6 | 12.2 | 13.4 | 32.5 | 17.1 | 17.1 | 12.7 | 7.6 | 10.2 | 9.1 | 12.7 | 13.5 | -- | -- | -- | -- |
| 27 | Schererville, USA | 14.5 | 19.1 | 13.5 | 13.4 | 11 | 12.3 | 30 | 16.9 | 16.3 | 11 | 6.5 | 8.8 | 10 | 14 | -- | -- | -- | -- | -- |
| 28 | North El Monte, USA | 14.4 | 8.4 | 7.5 | 9.1 | -- | 19.9 | 15.3 | 21.2 | 15.5 | 20.4 | 10.9 | 4.9 | -- | 14.3 | 15.6 | -- | -- | -- | -- |
| 29 | Willowbrook, USA | 14.4 | 12.7 | 11.5 | 9.2 | 15.4 | 11.2 | 10.1 | 16.6 | 14.1 | 16 | 15.1 | 16 | 24.1 | 12.7 | -- | -- | -- | -- | -- |
| 30 | Grove City, USA | 14.3 | 15.7 | 13.2 | 12.1 | 11.7 | 12 | 30.6 | 17.6 | 18.2 | 12.2 | 7.6 | 11.6 | 10.1 | 13 | 13.5 | -- | -- | -- | -- |
| 31 | Orrville, USA | 14.3 | 16.1 | 14.7 | 12.1 | 11.5 | 11.3 | 30.9 | 17.2 | 17.1 | 11.6 | 7.4 | 11.3 | 10.1 | 13.1 | 14.6 | -- | -- | -- | -- |
| 32 | Republic, USA | 14.3 | 19 | 16.8 | 13.2 | 7.6 | 8.2 | 9.7 | 9.8 | 46.8 | 10 | 9.9 | 12.3 | 6.9 | 14.9 | 24.1 | -- | -- | -- | -- |
| 33 | Crown Point, USA | 14.2 | 18.8 | 13.1 | 13.4 | 11.2 | 11.7 | 31.1 | 17.3 | 16.7 | 11.2 | 6.5 | 8.5 | 7.8 | 13.9 | 13.6 | -- | -- | -- | -- |
| 34 | Columbus, USA | 14.2 | 9.9 | 11.1 | 14.3 | 11 | 17.8 | 21.1 | 17.7 | 18.2 | 17.8 | 11.4 | 9.8 | 8.7 | 13.4 | 14.2 | -- | -- | -- | -- |
| 35 | Hope Mills, USA | 14.2 | 11.5 | 11.5 | 13.4 | 10.8 | 12.1 | 22.3 | 17.3 | 15.5 | 14.2 | 8.8 | 14.4 | 7.6 | 11.2 | 11.1 | -- | 12.2 | -- | -- |
| 36 | Selinsgrove, USA | 14.2 | 14.5 | 15.3 | 9.8 | 10.9 | 9.4 | 33 | 16.8 | 12.6 | 8.8 | 7 | 20.2 | 17.8 | 14.1 | 13.9 | -- | -- | -- | -- |
| 37 | Yukon, USA | 14.2 | 16.3 | 15.1 | 12.8 | 11.5 | 14.1 | 24.9 | 18.6 | 13.1 | 12.3 | 7.2 | 13.3 | 10.6 | -- | -- | -- | -- | -- | -- |
| 38 | Willow Creek, USA | 14.1 | 12.1 | 16.7 | 9.1 | 5.2 | 4.7 | 4.1 | 11.7 | 52.1 | 23.3 | 6.9 | 14.5 | 8.8 | 20.2 | 21.5 | -- | -- | -- | -- |
| 39 | Charlotte Hall, USA | 14.1 | -- | -- | -- | 10.9 | 11.5 | 28.9 | 17.8 | 14.3 | 10.5 | 8.6 | 11.2 | 12.2 | 12.2 | 14.1 | -- | -- | -- | -- |
| 40 | Deschutes River Woods, USA | 14.1 | 11.1 | 9.4 | 7.1 | 3.9 | 6.4 | 5.3 | 19.6 | 53.8 | 17.1 | 9 | 14.2 | 10.6 | 20.2 | -- | -- | -- | -- | -- |
| 41 | Camp Hill, USA | 14.1 | 15 | 14.8 | 10.3 | 12 | 11.6 | 30.7 | 17.9 | 14.2 | 11 | 6.7 | 10.8 | 15.7 | 12.9 | 14.1 | -- | -- | -- | -- |
| 42 | San Bernardino, USA | 14 | 6.8 | 8.1 | 10.6 | 18.4 | 17.8 | 18.9 | 19.2 | 13.3 | 21.1 | 10.5 | 9.2 | 14.4 | 13 | 14.1 | -- | -- | -- | -- |
| 43 | Sandy Springs, USA | 14 | -- | -- | 14.4 | 11.3 | 14.8 | 23 | 18.4 | 16.1 | 15.7 | 8.3 | 11 | 8.6 | 8.5 | -- | -- | -- | -- | -- |
| 44 | Clinton, USA | 14 | 19.8 | 12.6 | 12.4 | 10.8 | 10.7 | 31.4 | 14.9 | 16.1 | 12.7 | 7.5 | 9.9 | 9.2 | 12.5 | 12.8 | -- | 9.3 | 9.5 | 12.2 |
| 45 | Gretna, USA | 14 | 22.1 | 9.6 | 15.8 | 11.2 | 14.8 | 18.6 | 15.1 | 15.6 | 19.8 | 6.4 | 6.8 | 9.6 | 8.5 | 13 | -- | -- | -- | -- |
| 46 | Schlusser, USA | 14 | 16 | 12.2 | 10.5 | 11.5 | 11 | 27.8 | 17.7 | 13.7 | 10.8 | 7.3 | 12.9 | 16.9 | 11.3 | 13.9 | -- | -- | -- | -- |
| 47 | Inverness, USA | 13.9 | -- | -- | -- | 8.4 | 7.9 | 36.4 | 18.1 | 16.6 | 10.7 | 7.3 | 7.6 | 7.7 | -- | -- | -- | -- | -- | -- |
| 48 | Valparaiso, USA | 13.9 | 18.9 | 13.1 | 12.7 | 11.2 | 10.3 | 25.3 | 18.1 | 18.3 | 12.1 | 7.4 | 10.5 | 10.8 | 13.9 | -- | -- | -- | -- | -- |
| 49 | Dubuque, USA | 13.9 | 19.7 | 12.8 | 12.4 | 10.9 | 11.3 | 33 | 14.4 | 16.7 | 12.7 | 6.7 | 7.6 | 9.1 | 10.8 | 13.7 | 11.6 | 12 | -- | -- |
| 50 | Columbus, USA | 13.9 | 15.4 | 13.4 | 11.9 | 11.6 | 11.4 | 29.9 | 17.2 | 16.8 | 11.7 | 7.2 | 11.3 | 9.6 | 13.1 | 13.6 | 10.8 | 11.6 | 6.7 | 5.5 |
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